@article{discovery10188057, pages = {1--6}, note = {This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.}, publisher = {Institute of Electrical and Electronics Engineers (IEEE)}, year = {2024}, title = {FAS-assisted NOMA Short-Packet Communication Systems}, month = {February}, journal = {IEEE Transactions on Vehicular Technology}, issn = {0018-9545}, keywords = {Block error rate (BLER); flexible-position antenna; fluid antenna system (FAS); non-orthogonal multiple access (NOMA); short-packet communication}, author = {Zheng, Jianchao and Wu, Tuo and Lai, Xiazhi and Pan, Cunhua and Elkashlan, Maged and Wong, Kai-Kit}, abstract = {In this letter, we investigate a fluid antenna system (FAS)-assisted downlink non-orthogonal multiple access (NOMA) for short-packet communications. The base station (BS) adopts a single fixed antenna, while both the central user (CU) and the cell-edge user (CEU) are equipped with a FAS. Each FAS comprises N flexible positions (also known as ports), linked to N arbitrarily correlated Rayleigh fading channels. We derive expressions for the average block error rate (BLER) of the FAS-assisted NOMA system and provide asymptotic BLER expressions. We determine that the diversity order for CU and CEU is N , indicating that the system performance can be considerably improved by increasing N . Simulation results validate the great performance of FAS.}, url = {http://dx.doi.org/10.1109/tvt.2024.3363115} }